Carburetor



T. B. EIKER CARBURETOR Oct. 18, 1932.

Filed July 19, 1932 INVENTOR 727400506 5 f/AE/f A'TTORNEY Patented Oct. 18, 1932 1 THADDEUS B. EIKER, or JEFFERSON BARRAcKs, MISSOURI i v cnnnunnron Application filed .mi e, 1932. Serial 1\To.'623,4=04i The invention has particular reference to vaporizing means for carburetors, whereby tofacilitate starting in cold weather and to render such devices more eflicient in their idling operations. 5 J' lhe improvements forming the essence of this invention are especially applicable to carburetors andthe like for internal combustion engines using liquid'hydro-carbon fuel,

and more particularly intended for use in motor vehicles, tractors, motor boats, etc. Most of such devices in the prior artembody an air intake tube in which is an adjustable butterfly valve, and a fuel nozzle communicates with the air intake tube at a point out-- wardly of the valve, that is, at the side of the valve farthest away from theengine. Such butterfly valves have usually been made slightly smaller in area than the cross-section of the air tube whereby to provide an annular space when the valve ispositioned transversely of the tube axis, and thus allowing a limited mixtureof air and fuel to pass the valve when adjusted to its idling I or starting. position. Difficulties have been experienced in obtaining a proper mixture of fuel and air, and particularly in obtaining-a sufficiently rich mixture for starting the engine in cold weather, and these objectionable features of therprior art have been overcome by the present invention. e V v Numerous attempts havebeen made in the past to solvethis problem by providing bypass tubes and othersuch arrangements, some of which have'communicated directly with the. main fuel supply chamber and therefore constitute a fuel supply supplementary to the mainfuel nozzle. Such a. by-pass continues to operate after the butterfly valve is opened and therefore it has an undesirable effect upon the complete mixture after the engine has become warmed up and operating under normal conditions. Furthermore, someof such attempts have been unsuccessful because, of the construction of the carburetor itself, principally in such devices where the fuel nozzle has been located a substantial distance away from the butterly valve. Applicant has found that the elfective'suction within the air intake tubeto draw fuel from the fuel nozzle varies inversely as the distance between the fuel nozzle and the butterfly valve, and therefore he has, found it highly desirable to locate his, fuel nozzle co-axially with the butterfly valve. Such a carburetor has been fully disclosed in appli- (iangs Patent No. 1 ,7;1 8,735, dated June 25,

92 An important object of the present invention is to overcome the'above mentioned objectionablefeatures of prior art carburetors by providingmeans for localizing or restrict ing thesuction at: a relativelysmall blind recess when the butterfly valve is substantially closed.

Si PATENT oFFicEf i Another object is to'provide such a device with means for Varying the suction recess .to compensatefor changes in atmospheric conditions under which the engine operates.

Another object is to provide such a device as will be extremely simple in construction and therefore economical to produce, and one which will be a substantialimprovement in the art. V

; Other objects and advantages will be apparent from'the following description when taken in connection with the accompanying drawing, wherein the invention is shown by way'of illustratiomand wherein Figure 1 is a top plan view of a carburetor embodying the present invention;

Figure 2 isfa vertical, transverse, sectional view on the line 2 -2 of Figure 1; a v

Figure 3 is a fragmentary, longitudinal, sectional view on the line 3-8 of Figure 2; Figure l is a view similar to Figure 3, illustrating a modified form of the invention;

Figure 5 is a similar View of still another form.

buretor includes an air intake tube 1O of the usual Venturi type having its inner end equipped with aflange 11 for attachment to the usualengine manifold or the like, and

The invention may be applied to various I having its outer end 12 open for the inward passage of air.

Preferably formed integral with the air intake tube 10 is the usual float controlled fuel. chamber 13, which may be connected by a threaded pipe 14 to any suitable source of fuel supply, such as gasoline or other liquid hydro-carbons.

The fuel chamber 13 communicates with a well 15 which preferably depends below the air intake tube 10 and from which a tube 16 rises and terminates in a nozzle 17 which is disposed within the air intake tube 10. The passage of fuel through the nozzle 17. is controlled by a needle valve 18 carried on a threaded spindle 19, said "spindle extending tl'irough a bushing 20 which is rotatable by means of a lever 21 and which is equipped with the usual abutments 22 for engagement with-astop nieniber-23 on the outer side of the air inlet tube 10. The bushing 20 is provided with'a reduced inner extremity 24L whicheX- tends into the air intake tube 10 and in opposedrelation to the nozzle 17, as clearly shown in liigure 2, and secured to said re duced portion is a butterfly valve 25. The valve 25 is preferably in the form of athin metallic disk whose periphery is adapted to fit snugly within the interior of the tube 10 when disposed transversely in the tube, such position being controlled by one of the abutment's22 coming against the'stop member 23.

The tube 10 may preferably be formed with a boss 26 at a point preferably transversely intersecting the axis of the nozzle 17. EX- tending in a. radial direction above said nozzle, the wall of the tube 10 is formed with a bore 27 extending through the boss 26. In the preferred embodiment the outer portion ofthe bore is enlarged and screw'threaded for the reception of a threaded plug29 which has a reduced diameter at its inner end 30 to snugly fit the interior of the bore 27. The

- diameter of the bore 27 "is greater than the thickness of the butterfly valve 25, and theinner extremity of the plug 29 is spaced from the inner surface ofthe tube 10 in such a manner as to provide a blind suction recess 31 which spans the edge of the butterfly valve.

That is to say, the width of the recess is greater than the thickness of the edge of the If desired the inner end of the threaded plug 29 may also be formed with a circular recess 32 to assist in vaporization of the fuel, as will hereinafter be described, and a lock nut33 cooperates with the threaded plug 29 and outer end of the boss 26 to lock the plug in its desired adjusted position.

In using the device, and-particularly when s'tartin'gthe associated engine in cold weather, thevalvfe 25'is positioned transversely to the axis ofth'e air intake tube 10 in such a way 'that'its adjacent edge substantially bisects the blind recess 31, and'therea'fter, asthe engine is turned over, the suction from the manifold to which the carburetor is attached will be localized, past the Valve, at the relatively small recess 31, and in view of the juxtaposition of the fuel nozzle to the valve and the proximity of the blind recess thereto there willbe caused asuitable quantity of. fuel to be positively drawn upwardly from the nozzle 17-, and, at the same time, air will be drawn inwardly in the tube 10 from its open end 12. The fuel and a'ir't'hus drawn in, strike the edge of the butterfly valve and the bottom and side walls of the recess 31, and in so striking these parts the fuel becomes thoroughly vaporized and mixed with theair. Thus a suflicientlyrich mixture is produced'to be easily combustible within the cylinders of the engin'e, and after the engine is warmed up the bi'itterfly valve 25 is opened to'permit the passage of more air in proportion to the fuel drawn in. 1

As soon as the butterfly valve is adjusted toa point where its ed'geis beyond the limits of the recess 31, said recessis no longer op-' erative, and from this it will be apparent that the localizing of the suction at the recess 31 will have no ill effect upon the normal op eration of the motor and therefore will require no special adjustment of the needle valve 18.

In order to -lnain't'ai-n the efiicient "idling operation and to facilitate starting'nn'der different atmosphericconditions, the depth-of the recess maybe varied by adjusting the plug 29 and lockingit-in its'adjusted position by mean'sofloek nut-33. Thus, in extremely cold weather it will'be necessary to have the recess deeper than-in warmwea'ther, and this adjustment maybe very quicklyand easily made withoutdisturbingthe setting of the needle valve 18. 7 7

In Figure 4 a modified form of the invention is illustrated wherein the wall of the tube IO and the boss 26-are provided witha threaded hole extendingall the way through 11:

'terfly'val've 25.. When this form'of thefinv'e'ntion is used it ma be desirableto pr0- vlde each carburetor with a plurality of screws 37, each screw of theset'having a different sized recess 39,-said screws being "selectlvely used to provide the prop'er recess for the particular operatin'g conditions.

From the foregoing it will be evident that an extremely simple and eifective means has been provided "for localizing or restricting suction and forming a by-pass for the mixture at a relatively small portion of the periphery of the butterfly'valve, and that such device, while being eflective when the but terfly valve is closed, will not operate to dis turb the needle valve 7 when the butterfly valve is open. Actual tests have proven that this'device renders the carburetor more eithcient, in that it produces a more thoroughly vaporized mixture and therefore economizes in the use of fuel by the engine.

Obviously, the invention is susceptible of further modification and the right is herein reserved to make changes in the details of construction and arrangement of parts within the scope of the appended claim.

Having thus described my'invention, what is claimed is In a carburetor, an air-intake tube, a butterfly valve adjustably mounted therein, a stationary fuel nozzle extending into said airintake tube in definite juxtaposition to the butterfly valve, the nozzle being within the area of movement of the valve, and means for actuating the butterfly valve, said valve being adapted to snugly fit the interior of the air-intake tube when positioned trans versely therein, the wall of the tube being apertured and fitted with a closure plug, the inner end of said plug being slightly spaced from the inner surface of the tube whereby to provide a blind recess for the by-pass of a fuel mixture when the valve is positioned 7 across the tube to bisect the recess, said bypass being inefiective when the valve is open ed beyond the limits of the recess. THADDEUS B. EIKER. 

